Patent US3689948A successfully refreshed from Google Patents.
US3689948A
Expired / Lapsed
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Polyvinyl alcohol gel support pad
Assignee: United States Department of the Army
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Filing: 1970-06-09
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Granted: 1972-09-12
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Expires: 1990-06-09
Abstract
Abstract A polyvinyl alcohol gel pad. The gel pad has properties which make it useful as a support pad in the prevention and treatment of decubitus ulcers (also known as pressure sores) and for other purposes. The polyvinyl alcohol gel is made by cross-linking high molecular weight polyvinyl alcohol using a cross-linking agent, such as formaldehyde, in the presence of an acid catalyst, such as hydrochloric acid, and by incorporating at least one internal plasticizer, such as propylene glycol, in the gel. The support pad is completed by putting a thin-film envelope around the gel.
Inventors
- 👤 David J Graves
- 👤 Charles R Ritchey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:35
CPC Classifications
A; A47; A47C; A47C27/00; A47C27/08; A47C27/088; A47C27/085; A61; A61G; A61G7/00; A61G7/05; A61G7/057; A61G7/05738; Y; Y10; Y10S; Y10S5/00; Y10S5/909
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
The support pad as defined in claim 1 wherein the thin-film envelope is a strong, flexible, elastic and tear-resistant polymeric material.
Claim 2
Dependent Claim
14 words
The support pad as defined in claim 2 wherein the polymeric material is polyurethane.
Claim 3
Dependent Claim
90 words
In the art of preventing and treating decubitus ulcers in which it is known to use an organosiloxane gel pad, the improvement comprising using a polyvinyl alcohol gel support pad wherein said pad comprises: a. a polyvinyl alcohol gel, wherein said gel is a cross-linked irreversible gel containing at least one internal plasticizer comprising a polyol compound and said gel exhibits the physical property of a slight amount of viscous creep and thereby conforms to body contours in contact with said pad; and b. a thin-film envelope inclosing said gel.
References Cited (Backward Citations)
US3308491A
Cited
US3518242A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |